I see on your power supply when I zoom up on it, it looks like C3 (47uf 63 volt) has the top buldged out. Can you feel if it is or if it is flat? If buldged, it would need to be replaced. Also at the same time, I would change C2 (100uf 25V or 50V) as well as this one is prone to failure due to being exposed to high heat all during its life and can cause low or loss of 5 volts, which will give either resets or not power up the game at all.
So if the ribbon cable being swapped around did not fix it, then this C3 likely is the cause. To verify, you need to measure the voltages going to the DMD. C3 keeps the 62 volts stable for the DMD to function. This would be the next suspected thing to check along with the -112v and -100v coming out of the power supply.